Maryland Division of Correction spokesman Mark Vernarelli says Kandelario Garcia-Ramos jumped a fence and escaped Saturday from the medium-security Maryland Correctional Institution in Hagerstown, about 70 miles northwest of Baltimore.
He says no sightings were reported as of early Saturday evening.
Garcia-Ramos was serving the first year of a 40-year sentence for a December 2007 tire shop slaying.
Prince George's County State's Attorney spokesman Ramon Korionoff says a few weeks after Garcia-Ramos was fired, he returned to the shop and fatally stabbed his former boss.
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